for someone like me I would even prefer to start trading with 20 dollars, this doesn't make you inexperienced it makes you more conscious of risk management.
Risk management is important in trading. People who ask for loans for trading purposes do not care about risk management. Otherwise, how could a person look for a loan to start trading knowing the fact that it is a too risky thing to do. There is no guarantee that you will be able to make some money. But there is a risk of losing your money.
So, I believe your thought of starting doing trade with 20 dollars is better than starting with $30. I didn't even mean to start with $30 in one trade. My total bankroll will be a $30 if I have a total of $300.